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**Problem**: You are in a hot air balloon, 400 m above the flat Texas plains. You look out toward the horizon.How far out can you see—that is, how far is your horizon? The Earth's radius is about 6400 km.

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You are in a hot air balloon, 400 m above the flat Texas plains. You look out toward the horizon.

How far out can you see—that is, how far is your horizon? The Earth's radius is about 6400 km.

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